This is a linkpost for https://en.wikipedia.org/wiki/Quantum_Bayesianism
Fair enough. I feel like I have a fairly good intuitive understanding of quantum mechanics, but it's still almost entirely intuitive, and so is probably entirely inadequate beyond this point. But I've read speculations like this, and it sounds like things can get interesting: it's just that it's unclear to me how seriously we should take them at this stage, and also some of them take MWI as a starting point, too.
Regarding QBism, my idea of it is mostly based on a very short presentation of it by Rüdiger Schack at a panel, and the thing that confuses me is that if quantum mechanics is entirely about probability, then what do those probabilities tell us about?
Depends what you mean by "about". The (strong) Qbist perspective is that probabilities, including those derived from quantum theory, represent an agents beliefs concerning his future interactions with the world. If you're looking for what these probabilities tell us about the underlying "reality" then that's an open question, which Fuchs et al are still exploring.